<p>The Earth was formed just over 4.5 billion years ago. &nbsp;What happened just after it formed and what were conditions like then? &nbsp;John Valley reveals what we have managed to discover about our planet’s very distant past, and how we did it.</p>

Barbara Romanowicz on Seeing Deep into the Earth

What moves the continents, creates mountains, swallows up the sea floor, makes volcanoes erupt, triggers earthquakes, and imprints ancient climates into the rocks? Oliver Strimpel, a former astrophysicist and museum director asks leading researchers to divulge what they have discovered and how they did it. 

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